DDC/CI (Command Interface) specifies a means for a computer to send commands to the monitor, as well as receive sensor data from the monitor, over a bidirectional link. Specific commands to control monitors are defined in a separate Monitor Control Command Set (MCCS) standard.
DDC/CI monitors are sometimes supplied with an external color sensor to allow automatic calibration of the monitor's color balance. Some tilting DDC/CI monitors support an auto-pivot function, where a rotation sensor in the monitor enables the operating system to keep the display upright as the monitor is moved between its portrait and landscape positions.
DDC/CI standard was introduced in August 1998. It described a full suite of bidirectional control protocols - DDC2Ab, DDC2Bi and DDC2B+ - in a single standard and provided a means for packaging Monitor Control Command Set commands. This release coincided with the MCCS 1.0 standard.
DDC/CI version 1.1 was adopted in October 2004[1].
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